An electrical power plant manages to send 90% of the heat produced in the burning of fossil fuel into the water-to-steam conversion. Of the heat carried by the steam, 40% is converted to the mechanical energy of the spinning turbine. Which of the following choices best describes the overall efficiency of the heat-to-work conversion in the plant (as a percentage)?
a. greater than 90%
b. 65%
c. less than 40%
d. 40%
e. 90%
c
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What does a waning crescent moon mean?
a. The changing Moon between full moon and third quarter b. The changing Moon between third quarter and new moon c. The changing Moon between first quarter and full moon d. The changing Moon between new moon and first quarter e. The changing Moon between first and third quarters
One of the rare galaxies that is isolated in space is likely to be a(n) ____
a. starburst galaxy b. ultra luminous infrared galaxy c. dwarf galaxy d. antenna galaxy e. spiral galaxy
While yet unseen, some gravitational evidence suggests the existence of dark galaxies
Indicate whether the statement is true or false
Motorcycle Mike is traveling behind an ambulance with a speed of 40 mph. The ambulance, traveling in the same direction, has a speed of 70 mph. When Mike hears the ambulance's siren, the frequency is _______ the actual frequency.
A. higher than B. the same as C. lower than